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NELSON M. IVATSON, OF DETROIT, MICHIGAN, ASSIGNOR OE THREE-FOURTHS TO ALFRED H. HEATH, IVILLIAM B. HEATH, AND SARAH A. MILLARD, OE

SAME PLACE.

ELECTRICAL ANNUNCIATOR.

SPECIFICATION forming part of Letters Patent No. 471,987, dated March 1892- Application filed August 1'7, 1891. Serial No, 402,843. (No model.)

To all whom it may concern.-

Be it known that I, NELSON M. WATSON, a citizen of the United States, residing at Detroit, in the county of rVayne and State of 5 Michigan, have invented certain new and use-' ful Improvements in Electrical Annunciators; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters and figures of reference marked thereon, which form a part of this specification.

This invention relates to new and useful improvements in electrical annunciators; and it consists in a certain construction and arrangement of parts as hereinafter fully set forth, the essential features of which being pointed out particularly in the claims.

The object of the invention is to provide simple and efiective means for indicating from which of two push-buttons or circuitclosers a call is being made, and in which the v arrangement is such as to obviate restoring or setting back the annunciator after indicating a call. mechanism illustrated in the accompanying drawings, in which 0 Figure 1 is a front elevation of the device.

Fig. 2 is a side elevation of Fig. 1, the inclosing case being in vertical section, showing the mechanism therein. Fig. 3 is an enlarged front elevation of the device with the case re- 3 5 moved.

Referring to the letters of reference, A designates a base, upon which is mounted a metal support B, carrying the operative mechanism of the annunciator.

O and D indicate two electro magnets mounted together upon the support B, one terminal of the wire or coil of each of these magnets being connected through their respective wires CL 0, which in common are connected with the bell-magnet E (also mounted on the support B) through the wire e, as clearly shown in Fig. 3, said magnet E being in turn connected with the binding-post b and battcry F through the wire d. The other termi- 5o nals of the coils of the magnets O D are con- This object is attained by the nected to their respective binding-postsf h by means of the wires to, from which said Wires extend to their respective push-buttons or circuit-closers 1 2 and to the battery F, the wire from push-button 1 connecting with mag- 5 5 net 0 and the wire from push-button 2 connectin g with magnet D, as shown.

In front of the magnets O D and in the magnetic field is located a soft-iron armature H, which is centrally pivoted by means of the screw it to an extension of the support B, the free ends of said armature standing adjacent to the poles of said magnets. Extending from the center of the armature H and formed in tegral therewith is a crank or L-shaped arm I, the outer end 1; of which projects through the elongated opening sin the front of the case K and engages in the slots in the lower end of the pointer or hand P, which is pivoted at u to the outer face of said case, as clearly shown in Figs. 1 and 2.

Mounted on the outer face of the case K are the numerals 1, 2, or other suitable charactors, that correspond with the numerals or characters of the push-bu ttons and with which 7 5 the pointer is adapted to register to indicate from which point a call is being made.

It will now be apparent that if the circuit is closed at push 2 a current will be established through magnet D, energizing said magnet and attracting that end of the armature adjacent thereto, causing said armature to swing on its pivot, carrying the projecting arm I thereof to the left, which, engaging with the lower end of the vibrating pointer P, will throw the index end of said pointer to the right, so as to register with the numeral 2 on the case, indicating that the circuit has been closed at the corresponding push-button,

as shown in Fig. 1. At the same time the current passes from magnet D by the wires 0 e to the bell-magnet E, and thence to the battery through the wire d, thereby ringing the bell R to call attention to the position of the pointer. If the circuit is closed at push 1, a current will be established through magnet O, energizing the same and attracting that end of the armature, swinging the arm I thereof to the right and causing the index end of the pointer to register with numeral 1 of the case, the bell being rung by the current passing from magnet 0 through the wires (t c to the bell-magnet E and thence to the battery, as before described. Should the circuit be again closed at push 1, the hand or pointer will remain stationary; but the ringing of the bell will call attention to the numeral indicated thereby, in which position the pointer will remain until the circuit is again closed at push 2.

The slot .2' in the the lower end of the pointer P loosely receives the end of the extension I of the armature H, allowing considerable free play to said pointer, whereby when the motion of the armature carries the pointer past the center of gravity it will fall to the extent of said slot, throwing the index end of the pointer a sufiicient distance to register with the numerals on the case, by which means the slight motion only of which the armature is capable is magnified to carry the index end of the pointer the desired distance.

It will now be apparent that this improved annunciator is simple, inexpensive, and eflicient in operation,in which there is little liability of the operative parts getting out of order, and obviating the necessity of restoring the annunciator after a call has been made.

Having thus fully set forth my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In an electrical annunciator, the combination of two electromagnets mounted together, an electric circuit for each of said magnets having a circut-closer therein, the centrally-pivoted armature located in front of said magnets, said armature having the projecting arm formed integral therewith,.the case or dial having characters mounted thereon, and the pointer pivotally mounted on said case, the lower end of said pointer being in direct but free engagement with said arm of the armature, substantially as specified.

2. In an electrical annunciator, the combination of two electro-magnets mounted together, an independent electric circuit for each magnet, each circuit having a circuitcloser therein, the armature centrally pivoted in front of said magnets, the free ends of which extend Within the magnetic field the reof, said armature being provided with the centrally-extending crank-arm formed integral therewith, the case having characters thereon, an d the pointer pivotally mounted on said case, the lower end of which being provided with an open slot that freely receives the end of the arm of the armature which projects through said case, substantially as specified.

3. In an electrical annunciator, the combination of the two electro-magnets mounted together, each magnet having an independent electric circuit provided with a circuit-closer, an electric bell located Within the circuit of each of said magnets, the centrally-pivoted armature located in front of said magnets, said armature havin gthe projecting L-shaped arm, the case having characters thereon, and the pointer pivotally mounted on said case, adapted to register with said characters, the lower end of said pointer having an open slot therein that freely receives the projecting arm of the armature, substantially as set forth.

In testimony whereof I ai'lix my signatu rein presence of two witnesses.

NELSON M. WATSON.

itnesses:

E. S. WHEELER, GAssIUs HoLLENBEcK. 

